Boron carbon black

Modification of the burning rates, pressure exponents, and temp coefficients of burning rate of the fluorocarbon composites has been accomplished with copper, lead, tin, sodium, ammonium and potassium fluoborates sodium, potassium, lithium, lead, copper and calcium fluorides potassium and ammonium dichromate lead and zinc stearate cesium carbonate potassium and ammonium sulfate copper chromite oxides of magnesium, copper and manganese boron zinc dust and carbon black (Ref 75)... 

PARAMETERS Expanded Graphite, ABG1005, 8wt% Natural Flake Graphite, 2939APH, 8wt% Boron-Doped Flake Graphite, 2939APH-RG, 8wt% Carbon Black, P-267, 5wt% Ni Powder, 10wt%... 

Nonspecific adsorbents. No functional groups or exchange ions on the surface. Adsorbents of this type are carbon black, boron nitride and polymeric saturated hydrocarbons (e.g., polyethylene). ... 

Among the other non-metallic elements are boron, a black, dusty, infusible powder carbon, in its ordinary form an amorphous (i.e. non-crystalline) black substance, of which the most familiar variety is charcoal carbon does not fuse, but at the enormously high temperature of the electric arc... 

A mixture of boric acid (1 g) and urea (11.8 g) was taken in 40 ml distilled water and heated at 70 °C until the solution became viscous the a-CNTs were soaked in it for nearly 2 h. They were later separated physically and dried in air at 40 C overnight. The dried sample was thermally treated at 970 °C for 3 h for 40 nm nanotubes in a N2 atmosphere, and for 12 h in the case of the larger diameter (170 nm) nanotubes, and then cooled down to room temperature. The product was subsequently heated in an NHt atmosphere at 1050 °C in case of 170 nm nanotubes and 900 C in case of 40 nm nanotubes for three hours to give black-coloured boron-carbon-nitride nanotube brushes. The products were investigated by transmission electron microscopy and other physical techniques. 

The susceptor materials used in high-temperature processing include zirconia, boron nitride, graphite, carbon black, sodium-beta alumina, zinc oxide, and silicon carbide. While each of these susceptor materials has relatively high dielectric losses at room temperature, silicon carbide is also refractory with a relatively good resistance to oxidation at temperatures up to roughly 1500°C.t ° ... 

Typical fillers glass fiber, carbon fiber, graphite, metal powders (bronze), molybdenum sulfide, boron nitride, carbon black, Ni-Zn ferrite... 

Under the license from the University of Akron for the ultrasonic devulcanization technology, NFM Co. of Massillon, Ohio, has built a prototype of the single-screw extruder for ultrasonic devulcanization of tire and rubber products (Boron et al., 1996 Boron, 1999). It was reported that retreaded truck tires containing 15 wt.% and 30 wt.% of ultrasonically devulcanized carbon black-filled SBR had passed the preliminary dynamic endurance test (Boron, 1999). 

Types of reinforcements include fibers of glass, carbon, graphite, boron, nylon, polyethylene, polypropylene, cotton, sisal, asbestos, metals, whiskers, etc. Other types and forms of reinforcements include whiskers, bamboo fibers, burlap fibers, carbon blacks, platelet forms (includes mica, glass, and aluminum), and hemp fibers (Chapter 2). 

When zirconium silicate (ZrSi04) or a mixture of Z1O3 and SiOj is reacted with aluminum in the presence of aluminum oxide and then rdieated, zirconium silicide (ZrSi ) becomes the major product. Titanium dioxide (TiOs) and boron (111) oxide (BgO,) with aluminum similarly form titanium boride (TiBs). If the reduction of the oxides such as TiOg or Si02 with aluminum is performed in the presence of carbon black, the carbides TiC and SiC are formed embedded in aluminum oxide. This subject is also treated in a British patent titled Autothermic Fired Ceramics. ... 

Synthesis from the Elements Prochazka [39] synthesized submicron pSiC powder with a surface area of 7 m g using direct reaction of high-purity silicon powder with carbon-black at temperatures between 1500 and 1650°C, but saw little densification with boron and carbon additions, suggesting that free sihcon is detrimental to densification. 

Boron oxide can also be converted to boron carbide by exothermic magnesio-thermic reduction in the presence of carbon black at 1000-1800°C [162],... 

Figure 36. Microstructure of boron carbide pressurelessly sintered with carbon black (after [197]).

Injection molding of boron carbide with 2-5 mass.-% carbon black was developed by Schwetz et al. [210]. Like in conventional processes known for oxide and nitride ceramics, the spray-dried powder blend was mixed with 18 mass-% organic binder and molded at 120°C and 45 MPa. Dewaxing was accomplished by heating in an atmosphere-controlled furnace at 100 mbar. The binder components decomposed thermally by cracking and evaporated within four days and temperatures up to... 

The boron carbide process can also start from blends of metal carbides, metal hydrides, boron oxide, boron carbide and carbon black ... 

Aluminum hydroxide Aluminum silicate, Boron carbide Carbon black Carbon fiber, Cellulose, Feldspar Graphite LX-782 Poly/inyl chloride Slllce Silica, amorphous hydrated. Silica, fumed,... 

---